LAYING THE FOUNDATION 9. Time Matters Some interesting facts about sound, light, and subatomic particles relate to time. Sounds are produced by the vibration of molecules in a material. The vibrations of the person’s vocal cords produce the sound of a person’s voice. These vibrations cause vibrations in the molecules in the air. The vibrations of sound travel in waves made up of kinetic energy. This kinetic energy is transferred from molecule to molecule in matter as it moves farther away from the source of the original sound. The kinetic, sound energy is lost to thermal energy as it travels through matter so that the sound diminishes until it can no longer be heard. | ||
